Socket.io Server无法向客户端发送数据

Question

我正在尝试通过Socket.io向客户端发送数据。 如果建立连接，我将收到一条消息。但是在socket.on（'connection'）之外，客户端没有得到任何东西。

UPDATE！

CLIENT.JS

import io from 'socket.io-client' 

const socket = io('http://192.168.178.54:3000', {
  transports: ['websocket', 'polling'],
})
socket.on('connection', data => socket.emit('recruiter_id', recruiter_id)) // TOP
socket.on('update_contact', data => console.log) // FLOP
socket.on('connection', data => console.log) // FLOP
socket.on('haha', data => console.log) // FLOP

SERVER.JS

this.io = require('socket.io')(this.server, {transports : ['polling', 'websocket']});
this.io.on('connect', (socket) => {
    console.log('connected');
    socket.emit('update_contact', {bla: "hi"});
    socket.emit('connection', {'michael' : 'ist doof'});
    socket.emit('haha', "hi");    // This will be emitted
    socket.on('recruiter_id', (id) => {
        this.socketMap.set(id, id);
        socket.emit('update_contact', {bla: "hi"});        
    })
    socket.emit('update_contact', {bla: "hi"});
});

服务器正在另一台计算机上运行。

Answer 1

您的客户端不会收听connection，因为箭头功能永远不会执行。您应该听取connect，而不是connected。试试这个：

CLIENT.JS

socket.on('connect', () => console.log('client connected'));
socket.on('connection', (data) => console.log('connection:', data));

Answer 2

Removing transports from client and server was the solution.